поставьте данные предложения в отрицательной и вопросительной формах.
Mary is sleeping
You are listening to the radio
I am studying
You are eating now
We are drinking coffee at the moment

Mary isn't sleepingIs Mary sleeping?You aren't listening to the radioAre you listening to the radio?I am not studyingAm I not studying?You aren't eating nowAre you eating now?We aren't drinking coffee at the momentAre we drinking coffee at the moment?